Tengo menos señal de lo normal, I have less signal than normal

Se me habia roto el microfono de este Samsung, compre otra placa que incluía pin se carga, microfono, antenas/pines de interner y datos, la cambie y se me terminaron desoldando unas antenas/pines, lo volvi a soldar y volvieron a funcionar pero realmente no funcionan normal, cuando yo estoy en un lugar cerrado con otro celular tengo poca señal y con este Samsung desde que cambie la placa y paso eso con las antenas/pines directamente no tengo nada o le cuesta mucho agarrar señal, es como que detecta la señal menos de lo habitual.

The microphone of this Samsung had broken, I bought another board that included a charging pin, microphone, antennas/internet and data pins, I changed it and I ended up unsoldering some antennas/pins, I soldered it again and they worked again but They really don't work normally, when I am in a closed place with another cell phone I have little signal and with this Samsung since I changed the board and that happened with the antennas/pins I directly have nothing or it has a hard time getting a signal, it is like it detects the signal less than usual.